Insulating layer 60 comprises, a dielectric material, such as, for example, alumina, cordierite, {TAIL ~ lanthanum oxide}, spinel, {HEAD ~ titania}, yttrium oxide, and the like, as well as combinations comprising at least one of the foregoing dielectric materials 
Insulating layer 60 comprises , a dielectric material , such as , for example , alumina , cordierite , { TAIL ~ lanthanum oxide } , spinel , { HEAD ~ titania } , yttrium oxide , and the like , as well as combinations comprising at least one of the foregoing dielectric materials
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