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