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We study the viscoelasticity of surface polymer monolayers by measuring thedynamics of thermal concentration fluctuations with surface light scattering.For various systems of proteins and synthetic polymers we find a semi-diluteregime in which both the elastic and viscous components of the dilationalmodulus show power law dependencies on the concentration. Surprisingly there isa universal relationship between the exponents for the two components: theviscosity scales with a power double that of the elasticity. These resultscannot be explained on the basis of theory developed for bulk systems, and asimple explanation for the singular 2d behavior is suggested.Comment: 4 pages, revtex4, submitte

Scaling of dynamics in 2d semi-dilute polymer solutions