Citation: Zhang, Han-Yue; Song, Xian-Jiang; Chen, Xiao-Gang; Zhang, Zhi-Xu; You, Yu-Meng; Tang, Yuan-Yuan; Xiong, Ren-Gen (2020). Observation of vortex domains in a two-dimensional lead iodide perovskite ferroelectric.. Journal of the American Chemical Society, , pp. -.