[en] Current-voltage characteristics were measured for Au-TiO₂-Ag structures with TiO₂ layers of 30-180 nm thickness. In the case of negative bias on the Au electrode, the conduction currents through TiO₂ layers follow over several orders of magnitude the Fowler-Nordheim formula for the field emission, allowing attribution of the bulk currents to tunnelling, seemingly through a Schottky bather at the Au-TiO₂ junction. In the case of reversed polarity the currents are also observed, but cannot be interpreted as tunnelling. (author)