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A random-matrix theory is presented which shows that breaking time-reversalsymmetry by itself does {\em not} suppress the weak-localization correction tothe conductance of a disordered metal wire attached to a superconductor.Suppression of weak localization requires applying a magnetic field as well asraising the voltage, to break both time-reversal symmetry and electron-holedegeneracy. A magnetic-field dependent contact resistance obscured this anomalyin previous numerical simulations.Comment: 8 pages, REVTeX-3.0, 1 figur

Weak localization coexisting with a magnetic field in a normal-metal–superconductor microbridge