In the random microstructure produced atR)35°, only the first
and second peaks, located at r/D)1 and 2, are evident, consistent with the observation in rendered images and the #NNdistribution.
For both R ) 55 and 80°, this correlation function shows order
as far as r/D ) 10, with a second peak located at r/D ) 3,
reflecting the hexagonally close-packed orientation of these
samples. The peaks are relatively higher in samples of lower
density. These analyses were performed on a single image for
each sample and could represent a bias due to local deviation
in morphology. Therefore, the following represents data comprised
over a scan area of 300 images representing single a
continuous region that is 25 μm × 10 mm in size.