Also I was just now getting power armor in use in my current game & the aliens now seem almost exclusively armed w/ particle guns but shouldn't the power armor offer some protection from this weapon type based on what the description says about it?
I don't have a game this advanced, but from the ufos:
PARTICLE BEAM PISTOL
damage 1 Shot "70 10"
dmgweight "particlebeam_light"
PARTICLE BEAM RIFLE
Snap Shot/Aimed = damage 1 Shot "110 10" dmgweight "particlebeam_medium"
"_3-Round Burst" = 3 Shots @ "110 10"
PARTICLE BEAM CANNON
Snap/Aimed = Damage "150 30" dmgweight "particlebeam_heavy"
"_4-Round Burst" = 4 Shots @ "150 30"
"_Unrestricted Blast" = 1 Shot spldmg "250 50" with splrad 3 : dmgweight "particlebeam_heavy"
vs
Power Armour (Protection)
Particle Beam Light = 30
Particle Beam Medium = 40
Particle Beam Heavy = 50
So yes, you are getting protection. (combat armour has zero for all 3 damage weights)
EDIT: Oh, I think it goes something like (Weapon Damage - (Armour Protection + Resistance)) *Shots Note that Aliens have Resistances to weapon damage types.