In Eq. 1, i is a bead of interest while j is another bead. Θ i, j is the angle between the polymer backbone at bead i and the polymer backbone at bead j. The two beads may or may not be part of the same chain. The backbone direction at a bead's location is estimated using the vector between the bead's two intramolecular neighbors, or its bond vector if it is at the end of its chain. The average in Eq. 1 is over all beads within 6.35 Å of bead i with the constraint i = j; 6.35 Å corresponds to the second minimum in the pair distribution function for this study's perfect-crystal infimer system at 270 K.