2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/20750We calculate the weak localization correction in the double crossover to broken time-reversal and spin-rotational symmetry for a disordered microbridge or a short disordered wire using a scattering-matrix approach. Whereas the correction has universal limiting values in the three basic symmetry classes, the functional form of the magnetoconductance is affected by eventual non-homogeneities in the microbridge.5 pages, RevTeX; 2 figuresMesoscale and Nanoscale Physicstext