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The local density of states of Ag(111) has been probed in detail ondisordered terraces of varying width by dI/dV-mapping with a scanning tunnelingmicroscope at low temperatures. Apparent shifts of the bottom of thesurface-state band edge from terrace induced confinement are observed.Disordered terraces show interesting contrast reversals in the dI/dV maps as afunction of tip-sample voltage polarity with details that depend on the averagewidth of the terrace and the particular edge profile. In contrast to perfectterraces with straight edges, standing wave patterns are observed parallel tothe step edges, i.e. in the non-confined direction. Scattering calculationsbased on the Ag(111) surface states reproduce these spatial oscillations andall the qualitative features of the standing wave patterns, including thepolarity-dependent contrast reversals.Comment: 19 pages, 12 figure

Disorder-induced local-density-of-states oscillations on narrow Ag(111) terraces