PCB copper coin embedded is a perfect option to transmit the heat of the circuit board,but limited manufacturing capaiblity as below:

Copper coin thickness: 0.8mm(min), 3.0mm(max), can not be more thicker than 3.0mm.

Copper coin size: 3.0mm X 3.0mm (min), 400.00 X 300.00mm(max);

Spacing copper coin to holes: 1.0mm;

Spacing copper coin to track: 1.0mm(min).