PCB design: vcc plane and via limitations

I'm newbie in PCB design and I'm trying to achieve my first 4 layer pcb.

Inner layers are gnd and vcc planes filled entirely with copper. My default trace/spacing is 0.1mm/0.1mm and drill size is 0.2mm.

I calculate that a via depending on that specs is limited to 0.5mA. Maybe I'm wrong. But if so, to transfer 2A from front layer to inner vcc plane, do I need to place at least 4 vias in front trace ?

What is the minimum clearance between this vcc via and inner ground plane ?

Thanks in advance for your help.

Answer

What is the minimum clearance between this vcc via and inner ground plane ?

This depends on the drill registration capability of your vendor, plus a bit of margin.

A typical figure at a shop capable of 0.1/0.1 space/trace and 0.2 mm drills is 0.25-0.3 mm for clearance from the hole to the plane (assuming no pad on the inner layers).

Another common way to deal with it is just include pads on the inner layers, and let the 0.1 mm copper-to-copper clearance, plus the pad annular ring, set the hole-to-plane clearance. Your fab shop might then ask to remove the inner layer pads to reduce drill wear, which I've always allowed them to do without issues.