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Optical properties of PtS2 and PtSe2. Optical constants of (a) PtS2 and (b) PtSe2. The insets show PtS2 and PtSe2 optical constants in the visible range. Measured and calculated reflectance spectra for (c) PtS2 and (d) PtSe2 on SiO2/Si substrate.
