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Observation of a critical field in the AMR. (A) Longitudinal resistivity 
measured as a function of the angle of the field in the plane 
at various field strengths (indicated). The curves were shifted along the y axis for clarity (resistance scale is indicated on the bottom left). (B) Corresponding 
measurements. (C) 
as a function of the field strength for 
. Colored dots mark the fields corresponding to the traces in A and B.
