Key points are not available for this paper at this time.
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 ±0·05 has been deduced to be n<3·0 and k<3·2.
Miller et al. (Tue,) studied this question.