Dynamic electron spin resonance, ESR measurements suggest that this paramagnetic, layered organic metal behaves similarly to cuprate superconductors. There is a dynamic equilibrium between doublet, D and triplet, T* states near the transition temperature to superconductivity T-c= 10+/-3 K; antiferromagnetic, AF resonance is observed from room temperature to approximate to 150 K, in this temperature region the temperature dependence of the D Lorentzian ESR line widths obtains a first order rate constant for the disappearance of the state (k(1) = 3.5 x 10(7) e(-111/T)/s) and T* ESR is not observed, it is detected only below 44 K when the lifetime of AF domains, tau(AF) decreases below 10(-10)s; the onset of superconductivity is ascertained by the appearance of an energy loss at exactly H=0 near 10 K and by the magnetization oscillations observed versus H below T-c when the samples are cooled in a non-zero field H; the fourfold increase in the relaxation time tau(1) for the half field T* ESR absorption near 10 +/-3 K is interpreted using the Gorter phenomenological relation tau(1)=C-H/alpha(H), C-H and alpha(H) are the heat capacity and lattice thermal contact coefficient of the spin system, at H.