. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 2. Coordinate system for two-layer problem. into the earth at the origin of cylindrical coordinates r, z, . (See Fig. 2.) Let the potential in the surface layer be V\ and the potential for z>a be V*. The conditions to be satisfied by the potential are: (1) The differential equations expressing the continuity of the currents dWi 1 dV1 dWx V2Vl =*—- + + — = 0 (3-1) dr2 r dr dz2 V2Vt = 0. () (2) The continuity of current and potential at the boundary Vt = Vt at z = a () 148

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