It should be noted that the terms 'ordered' and 'disordered' used here refer specifically to the configuration and ordering of the organic phase, not the inorganic metal-halide octahedra framework. For the double-layered LHP, Dahod et al. observed that its phase transition temperature increases as the spacer alkylammonium chain length increases, while it decreases upon substituting MA cation inside the cage with a different cation, namely, formamidinium (FA). Meanwhile, the phase transition temperature remains insensitive to the number of octahedral layers. Moreover, they hypothesized that the contraction of the organic layer might induce a shearing in the inorganic layers, postulating this as a potential reason for the expanded line width observed in their powder diffractograms. On the other side, based on the observed similarities in structural dynamics between the 2D perovskite (BA) 2 PbI 4 and the 3D perovskite (MA)PbI 3 , Menahem et al. suggested that the phase transition in 2D ALHPs is multifaceted. In addition to the melting of the BA cations, the unlocking of hydrogen (H) bonds and the subsequent anharmonic tilting of the octahedra are crucial to triggering the phase transition, suggesting a combined displacive and order-disorder mechanism for the phase transition.