Analysis of ellipsometric data obtained from curved surfaces
  This article deals with quantitative error analysis resulting from ellipsometric data obtained from measurement on curved surfaces including the influence of non-collimated beams. Numerical model based on the combination of geometrical and wave optics is restricted to the example of single dielectric layer deposited on the substrate with complex index of refraction. Three methods for averaging measurable ellipsometric data are compared. 
Jaromir Krepelka
physics.optics