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. 2014 Jul 2;4:5530. doi: 10.1038/srep05530

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The SHG images show two monolayer WS₂ triangles on the same SiO₂/Si substrate. The polar plots show the normalized polarization dependence of SHG in WS₂ monolayer islands. Dots are measured data and the solid curves are the theoretical fit. The two polar plots reveal a rotation of 18 degrees between the two triangles.