the figure scaling regimes are observed which are consistent with Eqs. (9) and (10) in an intermediate range of $k$–values. Both $S_{\parallel}$ and $S_{\perp}$, however, develop tails at large $k$ which show significant deviations from scaling. These deviations can be traced back to irregular shapes of overcritical nuclei growing against the disordered bulk (cf. Fig. 2). Such highly structured grain boundaries eventually meet, leading to likewise structured domain walls when the regime of slow coarsening is reached. Small inclusions of disordered phase still remain trapped between boundaries of ordered grains for quite a long time after the onset of coarsening processes in the bulk of the crystal.

Closer inspection of our data near the onset of those tails reveals that indeed, with increasing time $t$, the validity of Porod’s law extends to larger $k$ in both parts of Figure 8. We may take this as indication that Porod’s law, defined by Eqs. (9) and (10), will dominate in the late stages of continuous as well as thermally activated ordering processes.

The last point we like to address concerns the observed growth rates of the characteristic domain–size, $l(t)$. Since the transition considered here is described by a set of non–conserved order 