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Head Stomp 
Feat 4
Source Pathfinder Advanced Player's Guide
Make an unarmed melee attack against a Prone target.
On a hit, the target becomes Flat-Footed to all attacks until the end of your next turn.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
RogueThis indicates abilities from the rogue class.