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The optical conductivity, $\\sigma(\\omega) = \\sigma_{1}(\\omega) + {\\rm i}\\sigma_{2}(\\omega)$, is isotropic within the (001) plane; its real part follows a power law, $\\sigma_{1}(\\omega) \\propto \\omega^{1.65}$, in a large interval from 2000 to 8000 cm$^{-1}$. 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