“…Theory of spectroscopic ellipsometry Spectroscopic ellipsometry for being comprehensive, non-contact, non-destructive, and also offering the possibility of in-situ characterization has become an effective surface probe 20,21,[26][27][28] for the optical characterization of thin films of interest. The SE spectra were denoted by the parameters W and D. RHO (q) represents the amplitude ratio of r p and r s , the reflection coefficients of the polarized light corresponding to parallel and perpendicular to the incident plane, respectively, while W denotes the amplitude ratio (tan(W) ¼ jr p j/jr s j) and D represents the phase shift between p and s components, respectively.…”