Ground bounce on a PCB Plane

[Freshman]

Suppose in my PCB, due to Ground bounce,the voltage on the reference plane of a PCB, for example, increases by,say 0.2V.

In the PCB stackup, the ground plane (or return plane) is typically a separate layer. Given this, my question is: Would the entire reference plane (the ground plane) experience a voltage increase of 0.2V from 0V (typically), or would the voltage increase be localized to specific areas of the reference plane, particularly around the IC where simultaneous switching noise (SSO) is generated?

If the latter is true, there would be a voltage gradient across the reference plane, correct?

[Whales]

Both.

(1) Voltage gradient.  Copper has resistance, there will always be voltage gradients.

(2)

> Would the entire reference plane (the ground plane) experience a voltage increase of 0.2V from 0V (typically)

Your ground plane may appear 0.2V above... what's your reference point?  A ground on another PCB?  Connected by a thin wire that has resistance?