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We report on magnetotransport measurements in a high-mobility two-dimentionalelectron system subject simultaneously to AC (microwave) and DC (Hall) fields.We find that DC excitation affects microwave photoresistance in a nontrivialway. Photoresistance maxima (minima) evolve into minima (maxima) and back,reflecting strong coupling and interplay of AC- and DC-induced effects. Most ofour observations can be explained in terms of indirect electron transitionsusing a new, ``combined'' resonant condition. Observed quenching ofmicrowave-induced zero resistance by a DC field cannot be unambiguously linkedto a domain model, at least until a systematic theory treating both excitationtypes within a single framework is developed

Resistance Oscillations in Two-Dimensional Electron Systems Induced by Both ac and dc Fields