bounded by two different bulk phases. When the bulk phases are identical the film
is described as symmetric.
PAC, 1994, 66, 1667
(Thin films including layers: terminology in relation to their preparation and characterization
(IUPAC Recommendations 1994))
on page 1671
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook