  We reveal that the interplay between Rashba spin-orbit coupling and
proximity-induced magnetization in a two-dimensional electron gas leads to
peculiar transport properties and large anisotropy of magnetoresistance. While
the related tunneling anisotropic magnetoresistance (TAMR) has been extensively
studied before, we predict an effect with a different origin arising from the
evolution of a resonant condition with the in-plane rotation of magnetization
and having a much larger magnitude. The resonances in the tunneling emerge from
a spin-parity-time symmetry of the scattering states. However, such a symmetry
is generally absent from the system itself and only appears for certain
parameter values. Without resonant behavior in the topological surface states
of a proximitized three-dimensional topological insulator (TI), TAMR
measurements can readily distinguish them from often misinterpreted trivial
Rashba-like states inherent to many TIs.
