In this recent paper, Jones and Price describe the application of finite difference methods to determining the electromagnetic fields near a vertical or inclined contact between materials having different resistivities. In the case of H polarization (the only case discussed in the following comments) they observed that as one approaches the contact from its conductive side the apparent resistivity decreases, which is to say that E horizontal decreases since H horizontal is constant. This behavior has previously been pointed out by d'Erceville and Kunetz (1962) for an analytical calculation. Jones and Price interpret this phenomenon as the effect of surface charges concentrating at the interface due to the impinging current.

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