“…10 The study of the effects of macroscopic inhomogeneity on charge transport properties dates back over sixty years to the study of Hall measurement sensitivity to inhomogeneous magnetic fields, [11][12][13][14][15][16][17] but more recently one group of researchers [SLU group], studying this problem for vdP geometries, defined, numerically calculated, and then directly measured what they have called resistive and Hall weighting functions, f and g, [18][19][20][21][22][23] for a variety of specimen shapes, quantifying the sensitivity of charge transport measurement to local inhomogeneities in R S and R HS . This group's work showed in a rigorous fashion much of what had already been largely assumed by researchers: the advantages of using square specimens rather than circular ones, 18 of using cloverleafs and crosses rather than circular and square discs, 20 and of placing electrodes at the corners of a square specimen rather than along its edges. 18 Another group of researchers [DTU group], studying sheet resistance and Hall (micro-Hall) effect measurements with linear 4PP arrays, developed a complementary notation [24][25][26] and has numerically calculated sensitivities of measured configuration resistances, R i;m , to local variations of not only R S and R HS but also of the specimen's microscopic materials properties, such as sheet carrier density, N S , and mobility, l.…”