Schlossman, M. L.Schwartz, D. K.Pershan, PeterKawamoto, E. H.Kellogg, G. J.Lee, S.2013-03-011991Schlossman, M. L., D. K. Schwartz, Peter S. Pershan, E. H. Kawamoto, G. J. Kellogg, and S. Lee. 1991. Relaxation and the reentrant appearance of phases in a molecular monolayer. Physical Review Letters 66(12): 1599-1602.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:10357549The structure of monolayers of \(CH_{3}(CH_{2})_{22}COOH\) on water, along \(\sim\)21\(^\circ\)C isotherms between 18 and 35 Å\(^2\)/molecule, has been studied with glancing-angle x-ray diffraction and specular reflection. Following an incremental area change, in some regions of the isotherm, the diffraction pattern evolves until the surface pressure \(\pi\) is relaxing \(\lesssim\) 0.01 dyn/cm h. Reentrant behavior between tilted and nontilted phases is observed. Phase coexistence is indicated by differences between the deposited area/molecule and the area of the x-ray-determined unit cell.en-USJournal Article2013-03-0110.1103/PhysRevLett.66.1599