This includes both textures and a substance material for use in Substance Designer 2018.3.3 or later.
This includes both the published .sbsar for use in engines, and the source .sbs file with comments, so you can examine how it was made and learn from it.
The textures are for those without Substance Designer.
They come in .tga format, at both 2048x2048 and 4096x4096 resolutions.
They include the base color, roughness, metallic, normal, and height maps.
The textures also come in 3 variants as pictured.
The substance has parameters assigned to let you control the tiling, the "health" of the grass (mostly transitioning the color from brown to green), and the shadow intensity.