Relevance of sub-surface chip layers for the lifetime of magnetically trapped atoms B. Zhang, C. Henkel, E. Haller, S. Wildermuth, S. Hofferberth, P. Krüger and J. Schmiedmayer Eur. Phys. J. D, 35 1 (2005) 97-104 Published online: 17 August 2005 DOI: 10.1140/epjd/e2005-00227-1