Seek help for space groups in 2 dimensions Bravais lattice

  1. 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
    https://www.physicsforums.com/attachment.php?attachmentid=55823&stc=1&d=1361080231
    structure 2
    https://www.physicsforums.com/attachment.php?attachmentid=55824&stc=1&d=1361080249
    structure 2
    https://www.physicsforums.com/attachment.php?attachmentid=55825&stc=1&d=1361080249
     

    Attached Files:

  2. jcsd
  3. Dr Transport

    Dr Transport 1,523
    Science Advisor
    Gold Member

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