Hi Scott, No worries. I guess we'll just have to agree to differ. We couldn't get a good correlation with Hammerstadt using measured microscopic parameters, which suggest to me at least that any macroscopic fit is fortuitous. "The best model for a cat is a cat. Preferably the same cat." Rosenblueth and Wiener, The Role of Models in Science. Philos Sci. 1945;12:316-321. ;-) Cheers, -- Colin -----Original Message----- From: Scott McMorrow [mailto:scott@xxxxxxxxxxxxx] Sent: Tuesday, November 22, 2011 4:46 PM To: WARWICK,COLIN (A-Americas,ex1) Cc: si-list@xxxxxxxxxxxxx; twesterh@xxxxxxxxxx Subject: Re: [SI-LIST] Re: surface roughness Colin Not ganging up on you at all. Just ganging up on the fact that the "Intel/Huray" approach of performing this level of microscopic detailed modeling is gross overkill. I'd certainly love to see good complex correlation of both magnitude and phase for the Huray model in a simulator. But, it's just not necessary, having done hundreds of models correlated with measurements using the Djordjevic-Sarkar model combined with the Hammerstadt-Jensen model (or other macroscopic model). Scott Scott McMorrow Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 (401) 284-1827 Business (401) 284-1840 Fax http://www.teraspeed.com Teraspeed(r) is the registered service mark of Teraspeed Consulting Group LLC ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu