[1] NIST, Mat Measurement Lab, 100 Bur Dr, Gaithersburg, MD 20899 USA
[2] German Aerosp Ctr DLR, Remote Sensing Technol Inst IMF, Oberpfaffenhofen, Germany
[3] Univ Aveiro, Dept Phys, I3N Inst Nanostruct Nanomodeling & Nanofabricat, P-3810193 Aveiro, Portugal
[4] US Naval Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 USA
[5] US Army, Res Lab, Combat Capabil Command, FCDD RLS EE, 2800 Powder Mill Rd, Adelphi, MD 20783 USA
[6] Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210008, Peoples R China
[7] Univ Toronto, Dept Phys, Toronto, ON, Canada