  The effect of spatial inhomogeneity on the properties of a two-dimensional
non-centrosymmetric superconductor in an in-plane magnetic field is
investigated, as it can be realized in LaAlO_3-SrTiO_3 interfaces. We
demonstrate that the spatial variation of Rashba spin-orbit coupling (RSOC)
yields a local magnetic flux pattern due to the field-induced inhomogeneous
helical phase. For sufficiently strong fields, vortices can nucleate at
inhomogeneities of the RSOC.
