Seek help for space groups in 2 dimensions Bravais lattice

harmonyU

Dear experts,
I'm not familiar with crystal structure theory. I'm seek expertise to figure out space groups in 2 dimensions Bravais lattice of the attached structures. In the figure, red and greens dots represent different atoms. I'll greatly appreciate your help.

Struture 1
http://www.physicsforums.com/attachm...1&d=1361080231
structure 2
http://www.physicsforums.com/attachm...1&d=1361080249
structure 2
http://www.physicsforums.com/attachm...1&d=1361080249

Attached Thumbnails

     

Dr Transport

do you see any symmetry planes????

harmonyU

Thank you men. I'm not familiar with space group in 2D bravais lattice. Can you give me your expertise answer?