The optimum angle of incidence for determining optical constants from reflectance measurements

Abstract
The shape of the boundary enclosing analytical solutions to the generalized Fresnel reflectance equations for n and k in terms of reflectances and angle of incidence has been investigated and the optimum angle of incidence for experimental measurement determined to be 74°. The distribution of reflectance values for fixed n and k for which the method is accurate to within ±005 has been deduced to be nk<32.