ATOMIC STRUCTURE OF INTERFACES IN GaAs/AlAs HETEROSTRUCTURES EFFECT OF LOCAL VARIATION IN THICKNESS G. SCHIFFMACHER, G. TESTE DE SAGEY, J.Y. LAVAL, C. DELAMARRE et A. DUBON J. Phys. Colloques, 51 C1 (1990) C1-921-C1-926 DOI: 10.1051/jphyscol:19901145