Angular correlations are calculated inside aggregation clusters of diffusion limited particle (PA) and cluster (CA) aggregation. The aggregates are isotropic for CA but anisotropic for PA, scaling differently parallel and perpendicular to the direction of growth. The correlation function exponents in two dimensions differ by ΔA = 0.16 ± 0.05 in the two directions. This leads to correction to scaling effects, especially for growth on a lattice.
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M. Kolb (1985) studied this question.
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