Embodiments of the present invention provide apparatus and method for reducing heating source radiation influence in temperature measurement during thermal processing. Alternatively, a layer of SiGe having a Ge content greater than 0. A first thermal disc is adjustable and allows the temperature of the coil to be adjusted. A method for treating fabric is provided. The second surface portion is comprised of a second surface major radius of curvature corresponding to a major surface axis and a second surface minor radius of curvature corresponding to a minor surface axis.