re: Roth 401k company match question

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So my question is this: if the Roth 401k is a post-tax contribution but the corresponding match is a pre-tax contribution, will the match be based on my post-tax or gross amount of contributions?

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I would think gross. If you were contributing to both trad 401k and Roth 401k they don't discount the amount you request be placed in the Roth by your tax withholding, so why would they use the post tax number as the basis for match. It is still % or stated dollar contribution of your gross salary, not pre or post tax salary. My wife's employer makes matching contributions to the traditional only, so if she was 100% Roth all matching goes into the traditional. YMMV. I could be wrong, too.