Communicationsof 60:40. Instead of the expected decrease in line width beyond 1.2" with increasing reaction time a short decline and thereafter a new rise is observed experimentally which is likely, however, to be a consequence of specific reaction kinetics.In the range of the renewed increase of the FWHM the reflection profiles are slightly asymmetric; in the case of the 002 reflection the asymmetry occurs at lower diffraction angles. This can be understood in terms of the following model: reactions proceeding homogeneously from a starting phase A to a product phase B do not necessarily exhibit sharp Bragg lines for the intermediate phases A, -.B, but can display a finite "broadening" of the stoichiometry in a Adv Mater 4 (f992) No. 6 <> VCH Yerlagsgesellsthaft mhH, W-6940 Weinheim, fY92 0935-9648/92j0606-04lY $ 3 50f 25/(1

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In the intermediate temperature and the upper pressure regions, the phase diagram of an eicosanol monolayer consists of four phases: (1) one normal condensed high-pressure phase, A', (2) and (3) two high-pressure superliquids, Rot I and Rot II, and (4) one low-pressure phase, C. The phase transitions A'/C and Rot II/C are of second order and correlated with a collective tilting of the molecules. The phase transition C/Rot I, however, is of first order and correlated with formation and growth of nuclei consisting of tilted or normally oriented molecules, depending on the direction of the transition. The kinetics of the