Interchain monomer contact probability in two-dimensional polymer   solutions
  Using molecular dynamics simulation of a standard bead-spring model we investigate the density crossover scaling of strictly two-dimensional self-avoiding polymer chains focusing on properties related to the contact exponent set by the intrachain subchain size distribution. Irrespective of the density sufficiently long chains are found to consist of compact packings of blobs of fractal perimeter dimension dp = 5/4. 
N. Schulmann and H. Meyer and J. P. Wittmer and A. Johner and J.   Baschnagel
cond-mat.soft physics.comp-ph