2D symmetry example

4 Examples of 2D Symmetry plane groups walked through and completed. Learn how to:
1) Identify lattice points.
2) Define a conventional unit cell
3) Identify symmetry elements (mirror planes, rotation axes, glide planes)
4) ID the plane group.
We will focus on tricks / tips / and pointers. (Example: how to define plane groups without ever finding a glide plane!)