Epitaxial films of orthorhombic lead dioxide alpha -PbO2 (Pbcn, a = 0.4971, b = 0.5956, and c = 0.5438 nm) were electrodeposited at room temperature on a [100]-oriented single crystal Au substrate (cubic, Fm3m, a = 0.4079 nm). The values of lattice mismatch are 21.9, 46.0, and 33.3% in the a, b, and c directions of alpha -PbO2, respectively. The films are [100]-oriented, with the a axis perpendicular to the substrate. Depending on the preparation conditions, the film was found to form two different in-plane orientations, with the unit cell of the PbO2 structure rotated either 45 or 11.5 degrees relative to the substrate. For the films deposited at low current density, only the first type of the in-plane texture is observed, while at high current densities both types are present in comparable amounts.