The Van-der Pauw measurement method, named after its inventor Leo J. Van der Pauw, is a widely used as a 4-point measurement for determining the sheet resistance and the Hall coefficient of materials. It can accurately measure the sample properties having any shape if the sample is 2-dimensional. It uses a four-point probe position around the perimeter of the sample rather than in a straight line. https://www.ste-mart.com/van-d....er-pauw-resistivity-
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