Diagnosing thin negatives

Can someone tell me (it was referred to in another post, but I can't find the relevant thread) about the "quick diagnosis" of thin negatives - how to you distinquish underexposed v. underdeveloped, are there any giveaways in the negative that will lean it towards one or the other? I have been using APX100 (4x5) rated at 64, with Rodinal 1:50 and am having a devil of a time pinning down "normal" development time, looking for help on "cues" in the negative that will indicate if my incosistency is in development or exposure. thanks!

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