I agree with Bob. We normally use Cl2 + O2, but SiCl4 should break up sufficiently to do the job. You do not need much O2. Also, do not expect to get much selectivity to your resist. Martin Walker ### OXFORD INSTRUMENTS http://www.oxford-instruments.com/ ### Unless stated above to be non-confidential, this E-mail and any attachments are private and confidential and are for the addressee only and may not be used, copied or disclosed save to the addressee. If you have received this E-mail in error please notify us upon receipt and delete it from your records. Internet communications are not secure and Oxford Instruments is not responsible for their abuse by third parties nor for any alteration or corruption in transmission.