NOVELTY - The layer system comprises a substrate (1), on which initially a barrier layer (2) followed by an intermediate layer (3) acting as an etching stop layer and subsequently an electrically conductive layer (4) are deposited, where the electrically conductive layer is structured using wet chemical etching unit. The substrate, the barrier layer, the intermediate layer and/or the electrically conductive layer are formed transparent against light in visible wavelength region and/or transparent in infrared wavelength region. The thickness of the intermediate layer is adjusted to 40-100 nm.    USE - Layer system useful as a base substrate for the construction of the optical components such as solar cells and organic light-emitting diodes.    ADVANTAGE - The layer system can be simply and effectively produced with good barrier properties against water vapor and oxygen and high optical transparency.    DETAILED DESCRIPTION - The layer system comprises a substrate (1), on which initially a barrier layer (2) followed by an intermediate layer (3) acting as an etching stop layer and subsequently an electrically conductive layer (4) are deposited, where the electrically conductive layer is structured using wet chemical etching unit. The substrate, the barrier layer, the intermediate layer and/or the electrically conductive layer are formed transparent against light in visible wavelength region and/or transparent in infrared wavelength region. The thickness of the intermediate layer is adjusted to 40-100 nm. The barrier layer consists of two inorganic partial layers, between which an organic partial layer is embedded, where the organic partial layer is formed as hybrid polymer. One of the both inorganic partial layers comprises a mixed oxide of zinc and tin. The substrate is formed as plastic film. An INDEPENDENT CLAIM is included for a method for producing a layer system.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a layer system.    Substrate (1)    Barrier layer (2)    Intermediate layer (3)    Electrically conductive layer. (4)