Optical image of a ReS₂ flake with terraces corresponding to 1–10 layers.

From the article:

Room-Temperature Ferroelectricity in $1{\mathrm{T}}^{\prime }$-${\mathrm{ReS}}_2$ Multilayers
Yi Wan, Ting Hu, Xiaoyu Mao, Jun Fu, Kai Yuan, Yu Song, Xuetao Gan, Xiaolong Xu, Mingzhu Xue, Xing Cheng, Chengxi Huang, Jinbo Yang, Lun Dai, Hualing Zeng, and Erjun Kan
Phys. Rev. Lett. 128, 067601 (2022)

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