[Wien] Euler angles.

[Sorin Lazar]

Dear users,

I have studied the mail list archive but still  it is not very clear for me 
how to use the Euler angles for a hexagonal case when you want to do EELS 
orientation dependant calculations? As far I know the Euler transformation 
is between two carthesian systems.  How that work when you have a hexagonal 
case?
For instance if you want to hit the specimen in the ab plane you can use 
(0,90,0) but the question is along of which direction will be the beam? 
Along of x [11-20] or along of [01-10] which is perpendicular on  y?

Thank you in advance,
Sorin
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