fig2
![Near-room-temperature reversible switching of quadratic optical nonlinearities in a one-dimensional perovskite-like hybrid](https://image.oaes.cc/d98cc803-660f-4424-93f5-f8df45bc70c0/4919.fig.2.jpg)
Figure 2. (A) Asymmetric units for molecular structures of (MP)PbBr3 collected at 350 and 193 K, respectively. 1D packing structures of (MP)PbBr3 in the (B) HTP and (C) LTP. Order-disorder changes are clearly observed during the phase transition. 1D: One-dimensional; HTP: high-temperature phase; LTP: low-temperature phase.