Step by step photographic illustration
NB: When building composite walls of any significant height, it is important to consult an experienced engineer. The law is very strict, with the NHBRC requirement stating that a wall can be built to a height of 1.2m without consulting an engineer, but as a general rule 1.5m for walls no steeper than 70º is also possible.
Any steeper and especially load carrying walls must be designed by a qualified engineer, even if only 1.2m high.
Remember to always ensure a good/correct foundation and that drainage systems are installed. This will prevent any unwanted ground movement that could cause damage to your retaining wall.