Adding to what @rszoeke said, use the Tetrahedral parametric with Minimal mesh edge length [m] and Maximum mesh edge length [m] of 0.003 since thickness of your plate is 0.006. This will make at least two elements over the thickness. Please note that this will create a bigger mesh in case of second order. Therefore you may need probably 8 cores for mesh and simulation.
I hope this helps. If you have any question/s, feel free to ask.