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Configuration for single semi-infinite slab observations, after Livshitz (2000). Conductivities σ1 and σ3 are zero. σ2 may be anisotropic. Sources (x,y,z′) are positioned at A and D for diagonal observations, and voltage differences are calculated between B and C. For orthogonal observations, sources are positioned at A and C and voltage differences are calculated between B and D.
