A remark on the reflection of light from a metal with a thin interfering non-metallic film

A number of results following from the author's theory of the reflection of light from a metal with a thin interfering non-metallic film are given. From the dependence of the azimuth and the phase difference on the thickness d ₁ of a thin film of Al₂O₃ with an index of refraction n ₁==1.635on aluminium it follows that the older Drude-Tronstad theory only holds for the thinnest films, at the most up to thicknesses around 100 Å.The course of the curves calculated according to the author's theory agree with the curves measured by Tronstad and Höverstad23 years ago for the depositing of films of Al₂O₃ on aluminium, in a solution of HNO₃.