Question1, Response: You can use "overlapping" instead of "Laminate" stack-up option inside HFSS 3D Layout to construct a plating on your top and bottom layers.
Question2, Response: For extracting RLGC you can use the CPA solver inside SIwave and use the Q3D solver.
Question3, Resposne: SIwave uses both 2D solvers and 3D solvers as per requirement.
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