Effect of 2 – thiocytosine on the parameters of double R-AgLAFe/ chlorate(VII) interface layer in the presence of different surfactants has been studied. There were determined the adsorption parameters such as: differential capacity of the double layer (C_d) at the R-AgLAFe/ basic electrolyte interface; potential of zero charge (E_z) and surface tension at the potential of zero charge (γ_z). The predominance of 2–thiocytosine in formation of adsorption equilibria of 2–thiocytosine–SDS and 2–thiocytosine–CTAB mixtures as well as the competitive adsorption between molecules 2–thiocytosine-surfactant or mixed micelles was proved. The changes pointing out to different arrangement of SDS or CTAB molecules on the electrode surface also in the presence of 2–thiocytosine were observed.