m-w.com says it can be appendixes or appendices. Not apendices, nor ap(p)endixii. And even if it were the latter, it seems to me that it would either be appendii or appendixi, not appendixii. Radius only becomes radii because the letter right before "us" is i, not because ii is added to it.
Of course, I like to refer to multiple DVDs that arrive in the mail as Netflices, so it's possible that you shouldn't listen to me.
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"There was a boy called Eustace Clarence Scrubb, and he almost deserved it." --The Voyage of the Dawn Treader, C. S. Lewis
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