Mechanically, in regards to damage reduction from a class and resistances from a race, would those stack? For example a Tiefling [fiendish resistances of 5/ (electricity, cold, and fire) has a class ability that would grant damage reduction 2/adamantium] and gets hit by a spell storing non adamantine weapon for the sake of example a short sword with a stored spell of shocking grasp. IE: effectively a +1 sword (+2 with spell storing) hits the character for 1D6 +1 (for being a +1 weapon) + STR or DEX if using weapon finesse (for the sake of argument let's say +3) + 1D6 electricity from the shocking grasp. Additionally lets say the attack rolled max damage on the 2 D6 rolls:
6 (weapon) + 1 (weapon enhancement) + 3 (character bonus to either STR or Dex) + 6 electricity damage. 10 physical damage and 6 electrical damage. In what order would you start applying damage reduction and or resistances for a total to apply to the above described Tiefling?