We demonstrate the relation θ=2φ. Here the exponent θ is defined as D~N^θ, where D is the equilibrium lamellar thickness of the diblock copolymer ordered phase and N is the molecular weight. The exponent φ is defined as l~t^φ, where l is the pattern size of the spinodally decomposing system (say, a binary alloy) and t is the time.
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Oono et al. (1988) studied this question.