Optical changes of visible radiation in transmission through evaporated manganese and bismuth thin films were determined using the Rayleigh-Lowe refractometer. The variation of the phase change in transmission with thicknesst>t c was utilized to determine directly the refractive indexn λ.
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Barakat, N., Mokhtar, S. & Al-Houty, L. A novel method for determining the optical constantn λ of metallic films. Appl. Phys. 20, 255–256 (1979). https://doi.org/10.1007/BF00886027