Previous studies have revealed that the rotational dynamics of organic cations, such as MA and FA, plays a crucial role in the phase transitions of 3D hybrid halide perovskites. It was elucidated that the phase transition in 3D hybrid halide perovskites results from a combination of several factors, including a subtle interplay between dipole-dipole interactions between the organic cations, the hydrogen bonding between the organic cation and the Pb-I lattice, and the deformation of the Pb-I lattice in reaction to the reduced rotational motion of the organic cations. However, the role of rotational dynamics of organic cations in the phase transition of 2D perovskites was not well understood. Unlike 3D perovskites, the 2D perovskites in our study contain both the MA cation inside the octahedral cage and the BA cation within the organic layer, affecting the phase transition differently. In our study,