The possibility of creating a two-dimensional region with anomalously high conductivity at the interface between two dielectric polymers has been demonstrated. It is established that the conductivity of such a boundary layer is several orders of magnitude higher than the surface conductivity of an individual film. The analysis of the results makes it possible to hypothesize that a layer with a quasi-two-dimensional electron gas is formed in the interface region between two dielectric polymer films. It is shown that, on the basis of this interface, it is possible to create chemical sensors and, in fact, sensors for the relative humidity of air and pH readings.