  We calculate the spectrum of the Andreev boundary modes in a two-dimensional
superconductor formed at an interface between two different non-superconducting
materials, e.g. insulating oxides. Inversion symmetry is absent in this system,
and both the electron band structure and the superconducting pairing are
strongly affected by the spin-orbit coupling of the Rashba type. We consider
isotropic s-wave pairing states, both with and without time-reversal symmetry
breaking, as well as various d-wave states. In all cases, there exist subgap
Andreev boundary states, whose properties, in particular, the number and
location of the zero-energy modes, qualitatively depend on the gap symmetry and
the spin-orbit coupling strength.
