Rights:
© 2002 American Physical Society (APS). This is the accepted version of the following article: Torsti, T. & Lindberg, V. & Puska, Martti J. & Hellsing, B. 2002. Model study of adsorbed metallic quantum dots: Na on Cu(111). Physical Review B. Volume 66, Issue 23. 235420/1-10. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.66.235420, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.66.235420.