X-band ESR measurements of Et2Me2P[Pd(dmit)2]2

X-band ESR measurements of aligned single crystals of Et2Me2P[Pd(dmit)(2)](2), which is considered to undergo antiferromagnetic transition at T-N = 18 K, were carried out with the static magnetic field up to 1 T. ESR signal was observed below room temperature. The linewidth at room temperature is almost 100 mT and it is relatively large compared to general radical organic compounds. The linewidth shows the minimum at 25 K and then increased as the temperature approached T-N. The g-values for all axes start to change below 25 - 35 K. These behaviors of the linewidth and the g-value above T-N are the typical behavior in low-dimensional antiferromagnet and they suggest that the short range order starts to develop below 25 K.