Magnetoresistance oscillations in a dimpled two-dimensional electron gas

We report on magnetoresistance measurements of a two-dimensional electron gas (2DEG) grown on dimpled substrates. As the 2DEG is sensitive only to the normal component of B, electrons will experience an inhomogeneous (B perpendicular to the substrate) or a sign-alternating ''tiled'' magnetic field (when B is parallel to :he substrate). In a titled magnetic field, Shubnikov-de Haas oscillations change the phase at high field because the introduction to the system of ''magnetic barriers'' i.e. regions with a large normal component of B. In a ''tiled'' magnetic field, magnetoresistance oscillations are found which may be due to snake-states traversing the sample, when the cyclotron radius is commensurable with the spatial periodicity of the magnetic field.