Defending: A defending weapon allows the wielder to transfer
some or all of the sword’s enhancement bonus to his AC as a bonus
that stacks with all others. As a free action, the wielder chooses how to
allocate the weapon’s enhancement bonus at the start of his turn
before using the weapon, and the effect to AC lasts until his next turn.
Moderate abjuration; CL 8th; Craft Magic Arms and Armor,
shield or shield of faith; Price +1 bonus.
dmg p224
bonus that stacks with all others* 惠惠酱~ 趴
个人认为楼上是对的,可以叠。当然,如果我理解错了请指教。
但是大部分同源按万律似乎的确不叠加,楼主举出的这个附魔只是特例而已
个人观点,不保证全对233