Journal Article 2D electron liquid Rashba spin‐orbit coupling Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. anomalous Hall effect complex functional materials complexes conducting oxide interfaces defect‐mediated polarization depth profiling gas quenching induced pyroelectricity magnetoresistance metal-insulator transitions metal-to-insulator transition nickelate superlattices non-destructive characterization orbital polarization oxide films oxide interfaces perovskite solar cells resonant X-ray reflectivity silicon spintronics strain superconductivity symmetry breaking thin film heterostructures triple cation