Angular Dependence of the Magnetoresistance of the SrTiO $_{3}$ /LaAlO $_{3}$ Interface

We study the magnetoresistance (MR) of the quasi-2-D electron liquid at the interface that forms between SrTiO₃ and LaAlO₃ as a function of the magnitude and orientation of the magnetic field. We find that at T ¿ 60 K, the MR is described by a + b cos² ¿ + c sin² ¿ cos² ¿, where ¿ is the angle between the field and the film normal and ¿ is the angle between the in-plane component of the field and the current. For ¿ = 0° (field perpendicular to the plane), we show that the MR obeys Kohler´s rule while for ¿ = 90° (field in the plane) the MR is significantly smaller, and it is almost temperature independent, suggesting it is dominated by interface scattering.