  We consider the pattern dynamics of the lamellar phases observed in
Rayleigh-Benard convection, as described by the Swift-Hohenberg equation, and
in the weak segregation regime of diblock copolymers. Both numerical and
analytical investigations show that the dynamical growth of the characteristic
length scale in both systems is described by the same growth exponents, thus
suggesting that both systems are members of the same universality class.
