A study of circular flat samples in connection with the van der Pauw and Wasscher methods and the magnetoresistance skewness effect for galvanomagnetic measurements is reported. The results concern the position of the four-contact system and the orientation of the magnetic field with respect to the principal resistivity directions on the sample plane. As is shown, the necessary information is provided by the sample behaviour. Furthermore, in the case of isotropic material, a simple formula has been found, from which the zero-field resistivity can be determined by a single measurement.
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