Contrary to the conventional ("exponential") model of contact charge creation and recombination, we consider here a recombination of a geminate ion pair occurring in a remote rectangular spherical layer. This simple model available for analytical solution enables one to discriminate between inner and outer generation of charges with respect to a thin recombination layer. In the slow diffusion limit, the qualitatively different viscosity and free energy dependencies of effective recombination rate are predicted for these alternative cases. The experimental verification of these predictions can provide clear evidence of noncontact electron transfer in liquid solutions.