Mitra, A buried resistor is a method of using a laminated material made up as follows: copper resistive material film (ie. nickel) substrate which then can be subtractively processed to yield planar resistors. This allows you to add resistors without putting them on the surface and without adding substantial thickness since the layer is 0.1-0.4 microns thick for the resistive material. My facility designs and fabricates using this technique for designs where the density is too great to use surface components. -- Robert Blomstrom Advanced Interconnection Technology, Inc. - Atlanta Phone: 404-938-9387 x226 3289 Montreal Industrial Way, Tucker, Ga. 30084 fax: 404-934-9885 e-mail address: [log in to unmask]