TIT# Oriented quiescent crystallization of polyethylene studied by USAXS. Part 2: The liquid scattering of stacks generated from random placement of lamellae AUT# Stribeck, Norbert; SOU# Macromol. Chem. Phys. (2004), submitted LOC# xv084 CLA# COM# APP# MAT# ABS# In part 1 of this series results of an in-situ small-angle X-ray scattering (SAXS) study of polyethylene crystallization are presented. They show that crystallite placement is basically a random process, from which some order is growing. This paper presents a first survey concerning the required change of paradigm. No distortion of a lattice is to be studied, but order grown on the nanometer scale must be distinguished from the stochastic case, i.e. the "car parking problem" from the field of random sequential adsorption (RSA). RSA is explored by computer simulation. The results concerning the corresponding liquid scattering are required to identify short-range order (cf. part 3). Processing of simulated scattering patterns verifies that the features of quasi-random arrangement are preserved in the interface distribution function (IDF), if only the crystals are shielded by some transition layer. In a condensed random nanostructure almost only next neighbor correlations are present. The distribution of the widths of amorphous gaps between the crystals, $h_{a}$, is a truncated exponential distribution. In the scattering pattern the stochastic nanostructure can hardly be distinguished from a system with short-range order. On the other hand, in the IDF the features of order become clear. In random systems there is no convolution polynomial based on crystalline and amorphous distributions. Only two shifted images of $h_{a}$ are occurring. We find that packing correlations collapse, if the crystallite thickness distribution is wide enough. In this case the pure particle scattering is a fair approximation in the IDF. This criterion is, in general, valid for technical polymer materials.