Making sure I understand how the resistance would work. A 20% reduction for the the Lead Lining modification looks like this:
<!-- Adding Lead Liner to Power Armor -->
<item_modifier name="modPowerArmorLeadLining" installable_tags="powerarmorHead,powerarmorChest,powerarmorArms,powerarmorLegs,powerarmorBoots" modifier_tags="PAhelmet,PAchest,PAarms,PAlegs,PAboots,PAboots" blocked_tags="noMods,clothing" type="attachment">
<property name="UnlockedBy" value="modPowerArmorLeadLiningSchematic"/>
<property name="CustomIcon" value="modPowerArmor"/>
<property name="CustomIcon" value="modPowerArmor"/>
<property name="Stacknumber" value="1"/>
<property name="Group" value="Mods"/>
<property name="DropMeshfile" value="#Other/Items?Misc/sack_droppedPrefab.prefab"/>
<property name="Material" value="Mlead_scrap"/>
<effect_group tiered="false">
<passive_effect name="BuffResistance" operation="base_add" value=".2" tags="buffRadiation01"/>
</effect_group>
</item_modifier>
So the total effect would be 1, with 5 liners installed, correct? Or do I need <the effect_group tiered="true"> because the effect accumulates?