We use a splay pattern to determine the exact orientation of wafers for anisotropic etching. Unfortunately we have "dropped" the mask and have had to resort back to x-ray diffraction. Does anyone know of a commercial source for these splay patterns? best regards mark Mark W. Lund, PhD Director >> Soft X-ray Web page http://www.moxtek.com<< MOXTEK, Inc. 452 West 1260 North Orem UT 84057 801-225-0930 FAX 801-221-1121 lundm@xray.byu.edu "The state is good at simple tasks, like killing people and seizing their wealth. It has far more trouble reaching inside individuals and making them good." Doug Bandow