The optical anisotropy of biaxially stretched poly(ethylene terephthalate) and poly(ethylene naphthalate) films has been investigated, by visible-far ultraviolet to IR spectroscopic ellipsometry (SE). The consistency of the SE spectra analysis results between the two energy regions, in a full rotational scan of the angle θ between the plane of incidence and the stretching direction, justified the approximation of the films as uniaxial materials with their optic axis parallel to the surface.
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Laskarakis et al. (2006) studied this question.
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