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. 2020 May 15;11:2428. doi: 10.1038/s41467-020-16291-9

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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, b Polarization dependences of Raman (3 K) and SHG (RT) spectrum of monolayer SnS, with parallel and perpendicular polarization, respectively. The gray shaded region of Raman spectra represents Raman peak from mica substrate. c, d Polar plots of Raman intensity at ~234.0 cm⁻¹ and SHG intensity at 425 nm, respectively. The inset axes show the armchair and zigzag directions.