did leonardo work with a student to paint the mona lisa stereoscopically?

2 years ago, the Prado Museum in Madrid announced that a painting long thought to be a relatively unremarkable copy of Leonardo da Vinci’s Mona Lisa was actually painted contemporaneously with the original, likely by a student following the master as he drew and painted the portrait. Infrared reflectography found that the 18th century black overpaint obscured a hilly background almost the same as the original. When the black overpaint and varnish were removed from the Prado’s copy, further infrared and X-ray analysis found underdrawings and alterations from the tracing and all the way through the upper paint levels that matched those in 2004 scans of the Louvre Mona Lisa. That means from the initial sketches to the changes and corrections as painting progressed, the Prado copy followed along at each stage.