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The observed H 2 and ͉H͉ dependence of the magnetoresistance above and below T C , respectively, may be explained by general time-reversal symmetry considerations. We further find empirically that the saturation observed in the magnetoresistance is best fit by a simple resistor in series with a magnetoconductor: (H)ϭ ϱ ϩ1/( 0 ϩ␥͉H͉) for TϽTc and (H)ϭ ϱ ϩ1/( 0 ϩ␤H 2 ) for T ϾT C . This provides a functional form to analyze and predict the magnetoresistance over a wide range of fields. Thisdoi:10.1063/1.116962 fatcat:u475gzwtvnbmhbmksw5grdwcpy