| http://www.w3.org/ns/prov#value | - itanium or tungsten, a ceramic or refractory metal, e.g. SiO2, Alumina AlO2 or Titania, TiO2, or other ceramic metal combinations. [0094] According to another aspect of this embodiment of the present invention, there may be gaps between each layer 302, as shown in FIG. 15.
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