  We present a detailed study of the effects of interface spin-orbit coupling
(ISOC) on the critical field behavior of non-centrosymmetric (NCS), ultra-thin
superconducting Be/Au bilayers. Parallel field measurements were made in
bilayers with Be thicknesses in the range of 2 - 10 nm and Au coverages of 0.5
nm. Though the Au had no significant effect on the superconducting gap, it
produced profound changes in the spin states of the system. In particular, the
parallel critical field exceeded the Clogston limit by an order of magnitude in
the thinnest films studied. In addition, the parallel critical field
unexpectedly scaled as Hc||/\Delta ~ 1/d suggesting that the spin-orbit
coupling energy was proportional to Delta/d^2. Tilted field measurements showed
that contrary to recent theory, the ISOC induces a large in-plane
superconducting susceptibility but only a very small transverse susceptibility.
