Adatom registry on Si(111)-(√3 × √3 )R30°-B

We have used tunneling microscopy to determine the binding site of adatoms on Si(111)-({}3 ×{} {}3 )R30^∘{} stabilized by surface boron doping. The adatoms are found to occupy the T₄ binding site, regardless of either the local dopant concentration or the presence or absence of a substitutional boron atom directly underneath individual adatoms.