  Warped models, originating with the ideas of Randall and Sundrum, provide a
fascinating extension of the standard model with interesting consequences for
the LHC. We investigate in detail how string theory realises such models, with
emphasis on fermion localisation and the computation of Yukawa couplings. We
find, in contrast to the 5d models, that fermions can be localised anywhere in
the extra dimension, and that there are new mechanisms to generate exponential
hierarchies amongst the Yukawa couplings. We also suggest a way to distinguish
these string theory models with data from the LHC.
