J-20 design influences from the ATF program.

Many are speculating that the Chinese have used the Mig 1.44 or the PAK-FA as its design influence.

I beg to differ.  Chinese espionage has been so prolific and at times effective against the US, I wonder how much information they on our ATF studies and program.  This via the Lockheed Martin website.

Model Of Boeing's Proposal For ATF

Boeing designers focused on the weapon bay and essentially designed the airplane around it. Wind tunnel results, especially those related to flight at high angles of attack, affected the arrangement, size, cant angles, and placement of the tails. The design used a single chin inlet with an internal splitter to feed the two engines. The inlet had an internal variable ramp (combined with the splitter) to reach its higher design speeds.

Lockheed Proposal Configuration For ATF

Lockheed's proposal configuration, called 090P, had a streamlined nose, trapezoidal wing planform with positive sweep on both the leading and trailing edges, and four tail surfaces (two horizontal and two vertical). The large vertical tails were canted outwards. The leading and trailing edge sweep angles of all of the surfaces were aligned at common angles. The design had a wide strake that ran in a straight line from the wing leading edge outboard of the inlets to the point of the nose.

Lockheed Configuration 090P Four-View

Lockheed's proposal configuration, called 090P, had a streamlined nose, trapezoidal wing planform with positive sweep on both the leading and trailing edges, and four tail surfaces (two horizontal and two vertical). The large vertical tails were canted outwards. The leading and trailing edge sweep angles of all of the surfaces were aligned at common angles. The design had a wide strake that ran in a straight line from the wing leading edge outboard of the inlets to the point of the nose.