a sheet of non reinforced thermoplastic material superposedly attached to said sheet of {HEAD ~ fiber} reinforced thermoplastic material, wherein both of said sheets are jointly deformed substantially differently along {TAIL ~ different axes} to form a cavity and wherein said sheet of fiber reinforced thermoplastic has a thickness which varies over said cavity, the thickness of the fiber reinforced thermoplastic being substantially thinner over said cavity than elsewhere 
a sheet of non reinforced thermoplastic material superposedly attached to said sheet of { HEAD ~ fiber } reinforced thermoplastic material , wherein both of said sheets are jointly deformed substantially differently along { TAIL ~ different axes } to form a cavity and wherein said sheet of fiber reinforced thermoplastic has a thickness which varies over said cavity , the thickness of the fiber reinforced thermoplastic being substantially thinner over said cavity than elsewhere
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