A highly ordered epitaxial adlayer of coronene on an Au(111) surface was prepared by a 'wet process' technique, which consisted of the simple transfer of Langmuir films. The structure and dependence on potential of the adlayer were then investigated by in situ scanning tunneling microscopy (STM). The adlayer possessed a (4x4)-Au(111) superlattice structure, and each coronene molecule was visualized as an individual hexagon on high-resolution STM images. The multilayer portion was present without any potential control, probably due to the excess generated by the transfer. The adsorption behavior of coronene, including the formation of the multilayers, showed dependence on the potential. A flawless adlayer without the presence of any multilayers was achieved by the application of a negative potential, in which the multilayer-substrate interaction was adequately weakened.