Magnetoresistance is a common phenomenon observed in many materials associated to either magnetic moments or external fields and with the direction of those with respect to the direction of the injected charges. Ordinary magnetoresistance, Anisotropic magnetoresistance, giant magnetoresistance, colossal magnetoresistance... and very recently, a new kind of magnetoresistance, called spin hall magnetoresistance (SMR), has been reported in non-magnetic/ferromagnetic -like bilayers. The physical origin of such magnetoresistance is still under debate. Whether it is only a spin related phenomena or other effects such as magnetic proximity might play an important role or not is still questionable. Aside from that, there are a few new reported works which cannot be fully explained only within SMR.

My question is whether interfacial resistance or other finite effects such us roughness at the interface can play an important role as well. Can Ordinari or Anisotropic MR show additional effects on in-plane vs out-of-plane applied magnetic field when working in thin films? In Pt for example, if grown epitaxially, can it show different MR dependent on the crystallographic orientation (OMR)? If so, can thin films case add any additional effect?