2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52179We discuss the interplay between freely acting orbifold actions, discrete deformations and internal uniform magnetic fields in four-dimensional orientifold models.12 pages, 3 figures, LaTeX file. Contribution to the Proceedings of the "String Phenomenology 2003" conference, Durham, England, 29th July - 4th August 2003High Energy Physics - Theorytext