Héctor M. BriceñoFlorencio P. Plachco2026-03-222026-03-222003https://andeanlibrary.org/handle/123456789/61533Common expressions for potential and resistance of linear electrodes in bi-stratified soils involve calculations with infinite series. The speed of convergence of these series depends on the K reflection factor associated with the resistivities of the surface and lower layer of the soil. Infinite series emerge as a consequence of the inversion from the spectral domain where algebraic solution of the problem is found. The proposed exponential approximation allows direct inversion from the spectral domain avoiding infinite series.esSeries (stratigraphy)MathematicsExponential functionInversion (geology)Reflection (computer programming)Mathematical analysisarticle