  The structures of long-range ordered physisorbed monolayer on a carbon
nanotube are examined. Geometrical and energetical constraints determining the
order of such monolayers are discussed. A number of symmetrically different,
strongly bound adsorbate structures is found for Xe adsorbates, some of which
differ very little in energy. The presented results suggest that the atomically
uniform coating of carbon nanotubes is possible and offer a clear visualization
of such coatings.
