We consider general 5-dimensional gauge theories compactified on an orbifold S1/Z2 with all fields propagating in the bulk. We propose a generalized set of boundary conditions and derive the general features of the low energy-spectrum. The results are illustrated with two simple examples.
PACS numbers: 11.10.Kk, 11.30.Er, 11.30.Qc, 12.20.Ds
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