2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27669We calculate the magnetoconductivity tensor of a 2D electron gas in a 1D periodic potential and quantising magnetic fields. We study the internal structure of the Shubnikov-de Haas peaks and analyse recent experimental results. The electron-electron interaction is accounted for within a screened Hartree-Fock approximation (HFA), which describes both compressible strips and an exchange-enhanced spin splitting, unlike the Hartree and the standard HFA.5 pages, sprocl.sty included, presented at 12-th HMFSP, Wuerzburg (1996)Condensed Mattertext