PCB Thickness and Score Depth Standards?

A couple questions for everyone: 1) is there an industry spec that calls out v-score depth requirements? If so, what spec is that and what are the values? I've always heard 1/3 of the depth of the PCB on each side, but I'm not sure if that's a rule of thumb or an actual documented standard? 2) Where can PCB thickness tolerance specs be found? IPC-A-600? 6012? Thanks in advance for any help!

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