SPHERICAL WAVE ANALYSIS AND MULTIPLE SCATTERING EFFECTS IN HYDROGENATED AMORPHOUS SILICON A. BALERNA, M. BENFATTO, S. MOBILIO, C.R. NATOLI, A. FILIPPONI et F. EVANGELISTI J. Phys. Colloques, 47 C8 (1986) C8-63-C8-66 DOI: 10.1051/jphyscol:1986809