alpha it is not plotted because even if the system is 2D yambo cannot define the non periodic length of the cell needed for the refactor of alpha.
The condition is that there must be one cell unit vector _|_ to the 2D non periodic plane that must contain both the other two cell vectors.
Please see the warning in the report:
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[code] [WARNING]Non periodic geometry and unit cell are incompatible
This is due because your A3 cell unit vector cell has small numbers n the first two component.
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Direct Lattice(DL) unit cell [iru / cc(a.u.)]
A1 = 1.000000 -.1873E-6 -.3338E-7 5.940704 -.9638E-6 -.1429E-5
A2 =-0.500000 1.000000 0.4477E-7 -2.970353 5.144801 0.1916E-5
A3 =-.2374E-5 0.3449E-5 1.000000 -.1410E-4 0.1774E-4 42.79823
Or as the vector is "nearly" orthogonal, you can just multiply the eps spectrum for the correct factor, note they are proportional.
Best,
Daniele