Antimony induced cluster formation on the Si(111)7 × 7 surface

► Surface structures induced by submonolayer Sb coverages on Si(111)7 × 7 were studied. ► Adatom substitutions and different cluster types were found using STM. ► Ringlike clusters are of special interest because of their high dominance. ► We observed the unique property of different apparent heights for ringlike clusters. ► A structure model was developed for ringlike clusters.