title: Effect of refractive index gradients on index measurement by the abeles method.
abstract: Abeles's method of determining the refractive index of a thin film is discussed. Attention is directed to the effect of a graded index transition between the film and the substrate on the measured index. First, a closed-form analysis of the problem for a long transition region is given. This is followed by a computer analysis applicable to transition regions of any length.
authors.forename: J E
authors.initials: JE
authors.lastname: Goell
authors.forename: R D
authors.initials: RD
authors.lastname: Standley