2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109565Low-field magnetoresistance is ubiquitous in low-dimensional metallic systems with high resistivity and well understood as arising due to quantum interference on self-intersecting diffusive trajectories. We have found that in graphene this weak-localization magnetoresistance is strongly suppressed and, in some cases, completely absent. This unexpected observation is attributed to mesoscopic corrugations of graphene sheets which cause a dephasing effect similar to that of a random magnetic field.improved presentation of the theory part after referees comments; important experimental info added (see "note added in proof")Mesoscale and Nanoscale Physicstext