“…Recently, three-wavelength interferometry has been used successfully to measure the spacing for a digital linear tape interface [8] as well as a multi-module head}tape interface [9]. The correlation between head/tape spacing and asperity compliance of magnetic taper [10}12] has been investigated analytically and experimentally by using three-wavelength interferometry to measure the head/tape spacing and the contact spacing of metal particle tape as a function of contact pressure.…”