Abstract. This paper derives the analytical formula for impedance two-layer media "dielectricconductor". In the winter on the Northern sea route and the salt lakes of Eurasia for demanding radio paths you can model two-layer media, where the first media (ice) is a dielectric layer and the second (sea, salt water) over a wide frequency range of radio waves is underlying conductive media. Two-layer media under consideration with real physical and geometrical parameters has strongly inductive impedance, which is calculated from a transcendental equation. The article shows that a large contrast between the electrophysical properties of the layers of ice and water allows you to set an approximate analytical formula for impedance, which is within the applicability of the impedance definition practically coincides with the decision of the transcendental equation. It was established that for the two-layer media impedance phase lies within -45.1 0 --89.9 0 , that is the criterion for heavily inductive surface.