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Recent hexadecapole (v4) and elliptic (v2) flow measurements are used toconstrain estimates for the degree of local equilibrium, mean free path$\lambda$, and the viscosity to entropy density ratio (eta/s) of the plasmaproduced in Au+Au collisions at RootS = 200 GeV. The eccentricity-scaled flowcoefficients v2/e2 and v4/e4 indicate that the plasma achieves a degree oflocal equilibrium within 5 - 10% of the value expected for a fluid with eta/sequal to the conjectured lower bound of 1/4pi. Estimates for $\lambda$ andeta/s as a function of collision centrality and particle transverse momentumpT, points to transverse expansion dynamics compatible with a strongly coupledlow viscosity plasma.

Is the quark gluon plasma produced in RHIC collisions strongly coupled?