2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150727First principles calculations show that H overlayers induce a honeycomb vacancy reconstruction on Al(111). Above one ML H coverage, Al(111) facets into surfaces vicinal to (111), with {100} faceted single and double steps and vacancies on the {111} terraces. These H induced reconstructions are stable because H binds more strongly to {100} than to {111} facets. Faceting of Al(111) explains step bunching in H-mediated epitaxy of Al(111). H-covered Al(100) is stable against faceting.6 pages, 2 figures, submitted to Phys. Rev. LettMaterials Sciencetext