BROADBAND SPECTROSCOPY OF ULTRATHIN LAYERS BY OPTICAL GUIDED WAVES TECHNIQUES, APPLICATION TO A 80 Å THICK a - Si : H LAYER M. Olivier, J. C. Peuzin et A. Chenevas-PauleJ. Phys. Colloques, 44 C10 (1983) C10-123-C10-126DOI: https://doi.org/10.1051/jphyscol:19831026