For a perfectly aligned local environment, P 2 is 1 while lower P 2 values indicate lower alignment between a bead and its neighbors. Due to thermal motion, the P 2 distributions for both the 270 K and 300 K infimer systems are unimodal peaks just below 1.0, and the 300 K distribution is broader (see Fig. ). The nucleation simulations exhibit broad, bimodal P 2 probability distributions (see Fig. ) with the high-alignment peak growing as crystallization proceeds. For this study, beads with P 2 values greater than or equal to 0.85 were labeled crystalline because: 1) the P 2 distributions for the nucleation simulations exhibit local minima at approximately 0.85 (see Fig. ), and 2) 0.85 is well below the lower tails of the P 2 distributions for the perfect-crystal infimer system (see Fig. ). For each nucleation simulation, each one of its saved configurations was analyzed to determine the P 2 values of its constituent beads, and thus assign the beads as crystalline or non-crystalline. Cluster analysis was then performed on the crystalline beads to establish the crystalline clusters within each configuration. Crystalline beads were considered to be part of the same cluster if they were within 6.35 Å of each other. A snapshot of the two largest clusters extracted by this process for the final configuration of a NVE nucleation simulation is shown in Fig. . Two large, noncontiguous clusters are visible, and the remaining clusters generally consist of only a few coarse-grain beads (see Fig. ), thus emphasizing that this study's simulations correspond to crystal nucleation, albeit in the low-barrier regime given the rapid appearance of the crystalline phase (see Fig. ). Once the crystalline clusters had been extracted from each configuration, their properties were analyzed in terms of constituent chains and stems. In this study, a stem corresponds to an uninterrupted sequence of crystalline beads belonging to one chain and one cluster, thus a single chain can give rise to multiple stems within a cluster. Moreover, for the purposes of this study, a fold is a sequence of non-crystalline beads belonging to one chain, and bounded by crystalline beads belonging to the same crystalline cluster. Henceforth, cluster sizes, stem lengths, and folds are reported in terms of number of carbon atoms; recall that each coarse-grain bead corresponds to three methylene units.