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© 2011 American Physical Society (APS). This is the accepted version of the following article: Berseneva, Natalia & Krasheninnikov, Arkady V. & Nieminen, Risto M. 2011. Berseneva, Krasheninnikov, and Nieminen Reply. Physical Review Letters. Volume 107, Issue 23. 239602-1. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.107.239602, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.107.239602.