Consider a simple cubic (001) surface with (2x4) surface reconstruction. Draw the LEED pattern from this surface.



Here's the answer:

Isn't the LEED pattern in reciprocal space? This to me seems to be a 2X4 reconstruction in real space...

 

What is a LEED? Is it an animal or an insect?

A light-emitter-diode is called an LED, not a LEED.

 

Google gets 536,000 hits on it - http://en.wikipedia.org/wiki/Low-energy_electron_diffraction

 

Low Energy Electron Diffraction

http://en.wikipedia.org/wiki/Low-energy_electron_diffraction

 

Beat you by seconds.