2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27903We derive the connection between the Cooperon problem in weak localization theory and the random matrix description of type-II superconductors. As magnetic field and disorder increase, an extreme type-II superconductor crosses over from a state in which the low energy quasiparticles are primarily localized and the density of states is determined by the electronic structure of individual vortices, to a `chaotic' state, in which quasiparticles are primarily extended and the density of states is determined by the random matrix description.27 pages, RevTex, 1 postscript figureCondensed Mattertext