Gas phase dosing of flame-annealed Pt(110) single crystal electrodes with an iodine/argon vapor results in the formation of ordered iodine adlayer structures on an unreconstructed (110) surface. Electrochemical STM images obtained in 1 M HClO4 electrolyte reveal a series of adlayer structures approaching a Pt-(110)-(2 x 1)-I adlattice structure with increasing exposure to the iodine vapor as corroborated by coulometric measurements following the oxidation of surface bound iodine adatoms. Also evident in the STM images is a surface reconstruction consisting of raised rows of closely packed Pt atoms oriented along the [001] direction. These monatomic high raised row features are distributed over the electrode surface. Initial investigations show that the extent of this surface reconstruction is independent of iodine exposure and the surface structure exhibits no observable potential dependent structural dynamics fora limited voltammograms reveal a significant degree of overall surface order and a multistep process leading to the deposition of either two successive adlayers or possibly a single high-density Ag adlayer prior to the onset of bulk Ag deposition.