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We propose an SU(5) SUSY GUT of flavour with A_4 family symmetry in 8d wherethe vacuum alignment is achieved in an elegant way by the use of boundaryconditions on orbifolds. The model involves SU(5) living in the 8d bulk, withmatter living in 6d (or 4d) subspaces and Yukawa interactions occurring at a 4dpoint. The GUT group is broken to the Standard Model by the orbifoldcompactification, setting the GUT scale and leading to low energy supersymmetryand Higgs doublet-triplet splitting. The first two families of 10-plets aredoubled resulting in a lack of both desirable and unwanted GUT relations. Theresulting four dimensional effective superpotential leads to a realisticdescription of quark and lepton masses and mixing angles includingtri-bimaximal neutrino mixing and an inter-family mass hierarchy provided inpart by volume suppression and in part by a Froggatt-Nielsen mechanism.

A_4xSU(5) SUSY GUT of Flavour in 8d