C.M., what country are you in, or referring to?
Most states adapt without modification the provisions in ICAO Doc 4444.
7.10 CONTROL OF ARRIVING AIRCRAFT
7.10.1 Separation of landing aircraft and preceding landing and departing aircraft using the same runway
Except as provided in 7.11 and Chapter 5, Section 5.8, a landing aircraft will not normally be permitted to cross the runway threshold on its final approach until the preceding departing aircraft has crossed the end of the runway-in-use, or has started a turn, or until all preceding landing aircraft are clear of the runway-in-use.
Note 1.— See Figure 7-3.
Note 2.— Wake turbulence categories of aircraft and longitudinal separation minima are contained in Chapter 4, Section 4.9 and Chapter 5, Section 5.8, respectively.
Note 3.— See 7.6.3.1.2.2.
7.10.2 Clearance to land
An aircraft may be cleared to land when there is reasonable assurance that the separation in 7.10.1, or prescribed in accordance with 7.11 will exist when the aircraft crosses the runway threshold, provided that a clearance to land shall not be issued until a preceding landing aircraft has crossed the runway threshold. To reduce the potential for misunderstanding, the landing clearance shall include the designator of the landing runway.