<http://webisa.webdatacommons.org/1473179>	<http://www.w3.org/ns/prov#value>	"9. A system as claimed in claim 8, wherein said spacing D is given by the formula: ##EQU3## where M is a magnifying power of the system, d.sub.1 is an interplanar spacing of a first of said two single crystal thin films, d.sub.2 is an" .
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