How do I downgrade from Sierra to Mavericks?

To whom it may concern.

I would like to downgrade from OS X Sierra to Mavericks but the Mac I have is the new version released in late 2016 with the touch bar, which only has access to OS X El Capitan on the Apple Store. If this is not possible, I would be fine just having a partition of the disk containing the old software.

How can I do that? Is there a way to download the correct OS X Mavericks that I couldn't find on the App Store on the web?

Thank you in advance.