energies. An interesting observation is that only the vdW energy displayed a pronounced jump at the phase transition temperature, as shown in Fig. in contrast to other types of energy that exhibit a continuous variation. The vdW energy primarily comes from the interactions between BA cations within the organic layer. It tends to increase as the temperature drops due to the decreasing distance between BA cations. At the onset of phase transition, the abrupt change in vdW energy can be attributed to the substantial structural rearrangement of the BA cations, a phenomenon further investigated in the subsequent section. rearranged BA cations, despite the continuous increase of interdigitation among themselves.