multi-layer circuit boards

are you supposed to be able to tell just by looking at them if they have multiple layers? Assuming you have one w/multiple layers, and I guess I already know the answer, it's a huge headache to try and draw up schematics (or duplicate the artwork rather) w/only photographs of the top and bottom of the board? You'd need knowledge of the ic's, which isn't that huge a deal perhaps, being I'm questioning this w/regard to very standard ic's and glue. ?I want my APC back. I need to create copies of the cpu and disk controller cards. I don't have ready access to these. Each of these boards is nearly the size of a IBM 5150 mobo, so would it make sense that they are anything but single layer boards? And the APC had 2 video boards, each w/it's own pd7220. ?I got to find that yogi guy.