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We examine the role of the microwave power in the linear polarization angledependence of the microwave radiation induced magnetoresistance oscillationsobserved in the high mobility GaAs/AlGaAs two dimensional electron system.Diagonal resistance $R_{xx}$ was measured at fixed magnetic fieldscorresponding to the photo-excited oscillatory extrema of $R_{xx}$ as afunction of both the microwave power, $P$, and the linear polarization angle,$\theta$. Color contour plots of such measurements demonstrate the evolution ofthe $R_{xx}$ versus $\theta$ line shape with increasing microwave power. Wereport that the non-linear power dependence of the amplitude of theradiation-induced magnetoresistance oscillations distorts the cosine-squarerelation between $R_{xx}$ and $\theta$ at high power.

Evolution of the linear-polarization-angle-dependence of the radiation-induced magnetoresistance-oscillations with microwave power