thermal resistance

Hello all, I chose this heatsink ( OMNI-UNI-18-50 ) to be used for each 2 SiC MOSFETs out of 6, I calculated the largest permissible thermal impedance between the junction and ambient air to be 4 C/W and the total power to be dissipated for every 2 MOSFETs is 36W. The MOSFET junction-to-case...