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. 2020 Feb 10;11:823. doi: 10.1038/s41467-020-14481-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Side view of the 1 T atomic structure of PbI₂. b Top view of the 1 T atomic model of single layer PbI₂. c Multislice ADF-STEM image simulation of the 1 T atomic model in b. d Line profile of the lead and iodide intensities marked with yellow line in the atomic model in c, along the direction 1-2. e Side view of 1 H monolayer atomic crystal structure of PbI₂. f Top view of the 1 H atomic model of single layer PbI₂. g Multislice ADF-STEM image simulation of the 1 H atomic model shown in f. h Line profile of the lead and iodide intensities marked with yellow line in the atomic model in g, along the direction 3–4. i Low-magnification ADF-STEM image of a monolayer PbI₂ flake suspended on graphene. j Higher magnification of the region indicated by the blue box in i, showing the 1 H atomic structure. k Line profile taken from region marked by the yellow box in j, which corresponds to same position with the region marked in simulation g, along the direction 5–6.